Merge pull request #391 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/specials-small-fixes to master

* commit '01124bcd':
  UpdateFieldSpecial checks if LSH==RHS to avoid incrementing reference count
  Always transfer to interpreter when throwing FullCallNeededException
  Replace more RCallNode.create with RCallSpecialNode.create

* commit '60d212fc':
  Added a comment in ParserGeneration related to recent parser change.
  Regenerated tests.
  Parsing of unicode symbols does not require all digits to be present.
  Define FASTR also when compiling C++ code.
  Make definitions of some native functions available as expected by packages that expect USE_RINTERNALS to be set.
  Support for creating shallow duplicates on the native side.

Merge pull request #387 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-specials2 to master

* commit '6411d09a':
  Special for UpdateField + fixes

Merge pull request #390 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:fix_assign_regression to master

* commit '7f08ae64':
  add the number-to-string cache optimization to ToStringNode
  remove optimization from "assign" that causes perf regression

Make definitions of some native functions available as expected by packages that expect USE_RINTERNALS to be set.

* commit '34c326e8':
  mx.fastr: only build release jar if FASTR_RELEASE is set
  native build: avoid generally unnecessary work

* commit '73be4af1':
  mx.fastr: pass jdk arg to mx.classpath
  mx_fastr: do not use mx.classpath(project) in do_run_r (binary release incompatible)

* major fix: check of replacement signature for specials
* refactoring: common code for subset/subscript specials
* accessField special now checks the class
* flat DSL layout for few nodes

* commit 'ec139208':
  Implemented support for perl-style regular expression in (g)regexpr.

* commit '08167c85':
  update to latest Truffle

Merge pull request #381 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-specials to master

* commit '2f2d4635':
  Specials for AccessField ($) built-in
  Specials for binary arithmetic/boolean operations
  Specials for UpdateSubset and UpdateSubscript
  Specials can check and accept/decline the signature of the call

Merge pull request #382 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/refactor-hocon to master

* commit 'ee3c17e5':
  ci.hocon: doc update

Merge pull request #379 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/refactor-hocon to master

* commit '7b60982d':
  ci.hocon: gate -> rgate
  ci.hocon: fix nested "packages"
  ci.hocon: no forward references
  mx.originalgate -> mx.gate; add rgate
  refactor ci.hocon